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Exam Code: CTFL v4.0

Exam Name Certified Tester Foundation Level (CTFL) v4.0

Certification Provider: ISTQB

Corresponding Certification: CTFL

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ISTQB CTFL v4.0 Practice Test 28

Question 270

During a release-readiness review, a tester observes: A medical web app performs every required calculation but shows unreadable labels to screen-reader users, and the team says accessibility is outside all testing. Which observation best verifies that the stated testing issue is addressed?

  1. An integration check reproduces the missing-token response while individual component tests still pass.
  2. The supported mobile client continues reading the field or receives an agreed versioned alternative.
  3. Relevant smoke and regression issues are detected before daily production promotion.
  4. A screen-reader user can identify fields and complete the medical workflow as specified.

Explanation

Correct Answer

D:

This is the expected verification outcome: A screen-reader user can identify fields and complete the medical workflow as specified. It directly checks the corrective activity (Include accessibility and relevant usability testing of realistic user workflows.) for the described testing problem.

Incorrect Answers

A:

This result may validate another testing scenario: An authentication library passes isolated component checks but fails when the mobile app calls it with a missing refresh token. It does not establish the required result for this case: A screen-reader user can identify fields and complete the medical workflow as specified.

B:

This result may validate another testing scenario: A content platform redesign removes a field from its API but deploys the change without checking the mobile app consumer, causing an existing feature to break. It does not establish the required result for this case: A screen-reader user can identify fields and complete the medical workflow as specified.

C:

This result may validate another testing scenario: A software team changes continuous deployment to daily releases but keeps a six-week feedback cycle for defects found in user acceptance testing. It does not establish the required result for this case: A screen-reader user can identify fields and complete the medical workflow as specified.

Question 271

During a release-readiness review, a tester observes: A medical web app performs every required calculation but shows unreadable labels to screen-reader users, and the team says accessibility is outside all testing. Which testing concept or underlying cause best explains the reported problem?

  1. Non-functional testing evaluates quality characteristics such as usability and accessibility.
  2. Acceptance testing assesses readiness for use and stakeholder needs, not only developer expectations.
  3. Interface changes can create regression failures in connected components and systems.
  4. Retrospectives support process improvement only when findings become acted-on changes.

Explanation

Correct Answer

A:

The most relevant explanation is: Non-functional testing evaluates quality characteristics such as usability and accessibility. This describes why the original situation (A medical web app performs every required calculation but shows unreadable labels to screen-reader users, and the team says accessibility is outside all testing.) merits the response: Include accessibility and relevant usability testing of realistic user workflows.

Incorrect Answers

B:

This principle could explain a different testing issue: A hospital conducts acceptance testing with only the development team's synthetic workflow, and actual clinicians find no provision for emergency priority overrides. The present case is better explained by: Non-functional testing evaluates quality characteristics such as usability and accessibility.

C:

This principle could explain a different testing issue: A content platform redesign removes a field from its API but deploys the change without checking the mobile app consumer, causing an existing feature to break. The present case is better explained by: Non-functional testing evaluates quality characteristics such as usability and accessibility.

D:

This principle could explain a different testing issue: An agile retrospective repeatedly lists environment delays but no corrective action is owned, so every iteration loses time to the same unavailable test database. The present case is better explained by: Non-functional testing evaluates quality characteristics such as usability and accessibility.

Question 272

During a release-readiness review, a tester observes: A medical web app performs every required calculation but shows unreadable labels to screen-reader users, and the team says accessibility is outside all testing. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Include negative boundary and error cases in interface contracts.
  2. Make accessibility criteria and assistive technology part of system acceptance.
  3. Include load and capacity criteria in the system test plan.
  4. Map specific test activities to each SDLC work-product milestone.

Explanation

Correct Answer

B:

This safeguard specifically targets the contributing cause: Make accessibility criteria and assistive technology part of system acceptance. It addresses the principle (Non-functional testing evaluates quality characteristics such as usability and accessibility.) and can be assessed by: A screen-reader user can identify fields and complete the medical workflow as specified.

Incorrect Answers

A:

This preventive step mitigates a different project risk (syllabus section 2.2): An authentication library passes isolated component checks but fails when the mobile app calls it with a missing refresh token. The targeted safeguard for the current case is: Make accessibility criteria and assistive technology part of system acceptance.

C:

This preventive step mitigates a different project risk (syllabus section 2.2): An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic. The targeted safeguard for the current case is: Make accessibility criteria and assistive technology part of system acceptance.

D:

This preventive step mitigates a different project risk (syllabus section 2.1): A bank uses sequential requirements, design and coding phases but does not plan any testing until developers finish the whole system, leading to late feedback. The targeted safeguard for the current case is: Make accessibility criteria and assistive technology part of system acceptance.

Question 273

A test analyst investigates the following quality concern: A new tax calculation component returns correct totals to its local unit tests but yields different rounding when invoked through the API currency serialization layer. Which testing activity or corrective action best addresses this situation?

  1. Execute system integration tests using realistic carrier responses and failure conditions.
  2. Check the interaction between the module and serialization layer with representative decimal values.
  3. Conduct consumer-oriented integration and regression tests before incompatible API schema changes.
  4. Clarify desired behavior and write a failing automated component test before coding the solution.

Explanation

Correct Answer

B:

The targeted action is: Check the interaction between the module and serialization layer with representative decimal values. It addresses the underlying software-testing principle: Interaction defects can occur at interfaces even when individual units meet their own specifications. The relevant confirming evidence is: The integration test reveals the rounding discrepancy and confirms corrected serialized totals.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. The present problem instead depends on: Interaction defects can occur at interfaces even when individual units meet their own specifications.

C:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): A content platform redesign removes a field from its API but deploys the change without checking the mobile app consumer, causing an existing feature to break. The present problem instead depends on: Interaction defects can occur at interfaces even when individual units meet their own specifications.

D:

This choice is a useful response to a different testing situation (section 2.1, Testing in the Context of a Software Development Lifecycle (SDLC)): A programmer writes production code before deciding what a small calculation should return, then adds a test that simply mirrors the implemented algorithm's wrong result. The present problem instead depends on: Interaction defects can occur at interfaces even when individual units meet their own specifications.

Question 274

A test analyst investigates the following quality concern: A new tax calculation component returns correct totals to its local unit tests but yields different rounding when invoked through the API currency serialization layer. Which observation best verifies that the stated testing issue is addressed?

  1. The integration test reveals the rounding discrepancy and confirms corrected serialized totals.
  2. Separate reports demonstrate correct fees and absence of discovered privilege bypass in tested scenarios.
  3. The integration test catches the incompatible carrier schema before customer delivery confirmations fail.
  4. The next iteration includes a targeted check that prevents the repeated defect class.

Explanation

Correct Answer

A:

This is the expected verification outcome: The integration test reveals the rounding discrepancy and confirms corrected serialized totals. It directly checks the corrective activity (Check the interaction between the module and serialization layer with representative decimal values.) for the described testing problem.

Incorrect Answers

B:

This result may validate another testing scenario: A payment provider creates a new authentication algorithm and counts a security penetration test as proof that its business rules calculate fees correctly. It does not establish the required result for this case: The integration test reveals the rounding discrepancy and confirms corrected serialized totals.

C:

This result may validate another testing scenario: A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. It does not establish the required result for this case: The integration test reveals the rounding discrepancy and confirms corrected serialized totals.

D:

This result may validate another testing scenario: A project ends a sprint with the same repeating defect pattern but treats its retrospective as a meeting that cannot change testing. It does not establish the required result for this case: The integration test reveals the rounding discrepancy and confirms corrected serialized totals.

Question 275

A test analyst investigates the following quality concern: A new tax calculation component returns correct totals to its local unit tests but yields different rounding when invoked through the API currency serialization layer. Which testing concept or underlying cause best explains the reported problem?

  1. Validated happy-path integration does not establish resilience under realistic dependent-service failures.
  2. Interaction defects can occur at interfaces even when individual units meet their own specifications.
  3. Interface changes can create regression failures in connected components and systems.
  4. Automation speeds execution but does not replace analysis or collaboration on what should be built.

Explanation

Correct Answer

B:

The most relevant explanation is: Interaction defects can occur at interfaces even when individual units meet their own specifications. This describes why the original situation (A new tax calculation component returns correct totals to its local unit tests but yields different rounding when invoked through the API currency serialization layer.) merits the response: Check the interaction between the module and serialization layer with representative decimal values.

Incorrect Answers

A:

This principle could explain a different testing issue: A system integration test sends requests to a simulated tax provider that always returns success, so production error behavior remains untested. The present case is better explained by: Interaction defects can occur at interfaces even when individual units meet their own specifications.

C:

This principle could explain a different testing issue: A content platform redesign removes a field from its API but deploys the change without checking the mobile app consumer, causing an existing feature to break. The present case is better explained by: Interaction defects can occur at interfaces even when individual units meet their own specifications.

D:

This principle could explain a different testing issue: A company uses nightly scripted browser tests but never reviews requirements, so everyone repeatedly automates checks for a misunderstood customer workflow. The present case is better explained by: Interaction defects can occur at interfaces even when individual units meet their own specifications.

Question 276

A test analyst investigates the following quality concern: A new tax calculation component returns correct totals to its local unit tests but yields different rounding when invoked through the API currency serialization layer. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Test critical data representation boundaries before full system release.
  2. Include representative supported environments in the test configuration matrix.
  3. Treat platform and dependency upgrades as triggers for change-impact testing.
  4. Preserve each defect's reproducing test and maintain an impact-based smoke set.

Explanation

Correct Answer

A:

This safeguard specifically targets the contributing cause: Test critical data representation boundaries before full system release. It addresses the principle (Interaction defects can occur at interfaces even when individual units meet their own specifications.) and can be assessed by: The integration test reveals the rounding discrepancy and confirms corrected serialized totals.

Incorrect Answers

B:

This preventive step mitigates a different project risk (syllabus section 2.2): A browser-based app performs exactly to requirements on desktop but cannot complete payment on supported mobile devices with a virtual keyboard covering the submit button. The targeted safeguard for the current case is: Test critical data representation boundaries before full system release.

C:

This preventive step mitigates a different project risk (syllabus section 2.2): A logistics company patches a production operating system and assumes maintenance testing is unnecessary because no application source code changed. The targeted safeguard for the current case is: Test critical data representation boundaries before full system release.

D:

This preventive step mitigates a different project risk (syllabus section 2.3): A point-of-sale app has an emergency hotfix for a crash, and release engineers validate only that startup succeeds while omitting the fixed crash path. The targeted safeguard for the current case is: Test critical data representation boundaries before full system release.

Question 277

In a fictional application-delivery project, the team reports: A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. Which testing activity or corrective action best addresses this situation?

  1. Add specification-based black-box tests derived from business rules and exclusions.
  2. Test the interface contract between calling application and authentication component.
  3. Run confirmation testing for the original coupon failure plus risk-selected regression tests of related discount behavior.
  4. Verify transitional behavior and dependent consumer migration under the deprecation plan.

Explanation

Correct Answer

C:

The targeted action is: Run confirmation testing for the original coupon failure plus risk-selected regression tests of related discount behavior. It addresses the underlying software-testing principle: Confirmation testing checks a specific fix; regression testing checks for adverse side effects. The relevant confirming evidence is: The original coupon case passes and previously working combination discounts remain correct.

Incorrect Answers

A:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): An insurance team executes code-based branch tests exclusively and overlooks a legally required policy exception absent from the implementation. The present problem instead depends on: Confirmation testing checks a specific fix; regression testing checks for adverse side effects.

B:

This choice is a useful response to a different testing situation (section 2.2, Test Levels and Test Types): An authentication library passes isolated component checks but fails when the mobile app calls it with a missing refresh token. The present problem instead depends on: Confirmation testing checks a specific fix; regression testing checks for adverse side effects.

D:

This choice is a useful response to a different testing situation (section 2.3, Maintenance Testing): An API provider deprecates an endpoint, but clients continue using it because the maintenance team tests only the provider's new implementation. The present problem instead depends on: Confirmation testing checks a specific fix; regression testing checks for adverse side effects.

Question 278

In a fictional application-delivery project, the team reports: A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. Which observation best verifies that the stated testing issue is addressed?

  1. The original coupon case passes and previously working combination discounts remain correct.
  2. Peak search latency is measured against an agreed service target under representative demand.
  3. An integration check reproduces the missing-token response while individual component tests still pass.
  4. The original reproduction no longer crashes and nearby checkout initialization still works.

Explanation

Correct Answer

A:

This is the expected verification outcome: The original coupon case passes and previously working combination discounts remain correct. It directly checks the corrective activity (Run confirmation testing for the original coupon failure plus risk-selected regression tests of related discount behavior.) for the described testing problem.

Incorrect Answers

B:

This result may validate another testing scenario: An online store completes functional checkout testing but users abandon the site because a product search takes twenty seconds during peak traffic. It does not establish the required result for this case: The original coupon case passes and previously working combination discounts remain correct.

C:

This result may validate another testing scenario: An authentication library passes isolated component checks but fails when the mobile app calls it with a missing refresh token. It does not establish the required result for this case: The original coupon case passes and previously working combination discounts remain correct.

D:

This result may validate another testing scenario: A point-of-sale app has an emergency hotfix for a crash, and release engineers validate only that startup succeeds while omitting the fixed crash path. It does not establish the required result for this case: The original coupon case passes and previously working combination discounts remain correct.

Question 279

In a fictional application-delivery project, the team reports: A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. Which testing concept or underlying cause best explains the reported problem?

  1. System quality includes device and usage-context behavior beyond a single functional test environment.
  2. System integration testing evaluates interactions between whole systems and external services.
  3. Confirmation testing checks a specific fix; regression testing checks for adverse side effects.
  4. Delivery performance and tested product quality are related but distinct dimensions of an SDLC.

Explanation

Correct Answer

C:

The most relevant explanation is: Confirmation testing checks a specific fix; regression testing checks for adverse side effects. This describes why the original situation (A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes.) merits the response: Run confirmation testing for the original coupon failure plus risk-selected regression tests of related discount behavior.

Incorrect Answers

A:

This principle could explain a different testing issue: A browser-based app performs exactly to requirements on desktop but cannot complete payment on supported mobile devices with a virtual keyboard covering the submit button. The present case is better explained by: Confirmation testing checks a specific fix; regression testing checks for adverse side effects.

B:

This principle could explain a different testing issue: A shipping service passes internal API integrations but a third-party carrier uses a changed response schema and confirmations disappear. The present case is better explained by: Confirmation testing checks a specific fix; regression testing checks for adverse side effects.

D:

This principle could explain a different testing issue: An organization assesses software testing success by deployment frequency alone, with no indicator of escaped high-severity failures after releases. The present case is better explained by: Confirmation testing checks a specific fix; regression testing checks for adverse side effects.

Question 280

In a fictional application-delivery project, the team reports: A software update corrects a failed coupon rule, and testers rerun only that coupon scenario while a nearby discount-rule regression escapes. Which repeatable testing practice most directly reduces recurrence of this problem?

  1. Require both fix evidence and impact-driven regression selection.
  2. Maintain negative partner response fixtures and recovery expectations.
  3. Add recovery fault-injection tests to relevant system-level suites.
  4. Review test cycle time and repair latency when altering release cadence.

Explanation

Correct Answer

A:

This safeguard specifically targets the contributing cause: Require both fix evidence and impact-driven regression selection. It addresses the principle (Confirmation testing checks a specific fix; regression testing checks for adverse side effects.) and can be assessed by: The original coupon case passes and previously working combination discounts remain correct.

Incorrect Answers

B:

This preventive step mitigates a different project risk (syllabus section 2.2): A system integration test sends requests to a simulated tax provider that always returns success, so production error behavior remains untested. The targeted safeguard for the current case is: Require both fix evidence and impact-driven regression selection.

C:

This preventive step mitigates a different project risk (syllabus section 2.2): An IoT controller is tested against its functional specifications but cannot restart cleanly after a power interruption. The targeted safeguard for the current case is: Require both fix evidence and impact-driven regression selection.

D:

This preventive step mitigates a different project risk (syllabus section 2.1): A software team changes continuous deployment to daily releases but keeps a six-week feedback cycle for defects found in user acceptance testing. The targeted safeguard for the current case is: Require both fix evidence and impact-driven regression selection.